Home · Astrophotography · Tele-Compressors Astro-Tech 2" field flattener for Astro-Tech and TMB refractors, plus any other brand of f/6 to f/8 refractor, and Astro-Tech Ritchey-Chrétiens The Astro-Tech 2" zero-power field flattener improves the image sharpness at the corners of the field with Astro-Tech and TMB apo refractors, but will also work well with any other f6 to f/8 refractor.
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